Synchronic twin phonograph.



. I. Nomi-:GIM

SYNCHROIIIIC TWIN PHONOGRAPH. APPLICATION FILED SEPT. 12 1,!5117.

2 SHEETS-SHEET `l mmm my 2,1918.

A H. NORIEGA. SYNCHRONIC TWIN PHQNOGRAPH.

APPLlYcATloN FILED SEPT. 12. 1911.

mmm my 2, 1918.

' z SHEETS-SHEET 2;

TALEN@ NORIEG'A, OIF MEXJICU, MJEKTOO.

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ASpecification of Lettera Patent.

AUHRUNTC TWIN PHONUGBH.

Patented aan e, roi.

dpplication led September 12, 1917. Serial No. 191,091.

ments in Synchronic Twin Phonographs,

of which the following is a specification.

My invention relates to phonographs and has for its object to provide a double phonograph of synchronistic functions, whereby it is possible to obtain unlimited phonographic reproductions of song, music, speeches, etc., in an uninterrupted manner. This is attained by disposing two synchronically operated phonographs to alternate in the reproduction of the record. lEach disk contains only such aportion of the entire record as will fit it, the rest being engraved in pieces on several disks, which when played at successive stagescomplete the full record, that of course may be of any length.

Tn the accompanying drawings Figure l is a side elevation of the double lphonograph, the front of the cabinet being removed as well as the horn. Fig. 2 is a plan view, with part of the turn-table at one side of the instrument, and the top of the cabinet at the other side, removed. lFig. 3 is a top View of the apparatus. Fig. 4 is a diagram of the electrical connections for the twin phonographs.

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.to'slide endwise whenpulled by either of the magnets (6) to the cores (5) of which its .two extremities are connected. l Un the` spindle (4L) are the dlsengagmg which mesh with the worm gears (7) wheels (8) attached' to lthe vertical shafts bill These shafts pass through the cover of the cabinet on top of which they carry the lturntables (l0) provided with central pms (16) and eccentric pins (17) thelatterof which project/'vertically in o poslte directions beyond the turn tables, t e upper portions piercing the disks, while the lower ortions contly touch `the contact p ate (18) on which they slide. The screw terminal (19) of each phonograph connects by wire to the magnet (6) at the opposite.y side of the cabinet.

Supported at the top of the cabinet are the phonograph amplifiers (11) each connected with its respectlveftone arm (l2) and reproducer (13).l These ampliers are curved once and both join at (14:) in the bell of the single horn not shown, but which extends horizontally out of the cabinet. Each reproducer (13) has a contact pin (l5) and a i stylus (24 ln the side of the cabinet arethe screw terminals (20,), to which the main wires (not shown) lead, these terminals (20) havingconnected to them conducting wires (likewise omitted) which supply .current first to the screw terminals (22) and (23), and next to the motor; and by' the screw,ter

minals (2l) areconnected with the magnets (6) and are electrically connectedwiththe motor circuit.

The parts 'of both of the; twin phonographs are identical, and for clearness of description l shall refer to these parts as a when belonging to one side (on the of the twin phonograph of the opposite side (on the right)- Y' The long compositions or other matter'to be reproduced are recorded on a seriesv of disks, so that when disk number l has been? recorded to its "full capacity vthen the contact pin (15a) of the left-hand recorder (13m) will have reached the eccentric contact vpin 17a' which closes the electric circuit wheres left), and b when referringto the parts i by the magnet (6") of the. opposite `or :mov

gravedon series of record disks, which i enable 'the Vreproduction of the 4whole `record practically without any interruption.

ow'for reproducing the stylus (24F) is set at the beginning of the record oove of disk npmber 2 .and remains inactive until the other 'stylus (24), which is operating on @disk number 1,v has concluded the reproduction of the record thereon, 'which-happens at the veryvlnoment the contact pinllm) touches the contact pin (17m), thereby closing 'the circuit of the right-hand magnet (6b), and attracting its core (5b), the consequence of which is, that the right-hand clutch (3") is thrown into gear and transmits motion to the turn table (10b), at the same time uncoupling the left-hand clutch (3a). Thus, when the phonograph of the b side starts, the motion of the phonograph of the a side stops.

When the instrument 'is not in use, motor circuit, which may be controlled by any suitable means, for instance a button switch, is open, and of the two clutches one is .coupled and the other uncoupled. In operation, and starting, with the left-hand phonograph, the motor 'circuit is closed by means of the above-mentioned switch, wherethe ' upon the motor commences to drive the shaft 2, the current iiowing from the mains through the terminals 20 to the conducting wires connected thereto and thence through the terminals 22 to the motor. The two magnet circuits are in the nature of secondary circuits which are normally open, one

or the other of these circuits being closed by the engagement of the respective contact pins (15a) and (17a) or (15b) and (17h). Assuming that the left-hand clutch (3a) is coupled, since it is the left-hand phonograph which is to be played first, the rotation of the motor shaft will be transmitted to the lefthand turn-table shaft and the corresponding tone arm (12a) and sound-box 3a) will be fed inward in the usual manner. When the contact pin (15a) on the soundboX strikes against the corresponding pin (17a), he circuit including the right-hand magnet (6") will be closed, the current flowing from one service terminal (20), which will be assumed to be the lower one in Fig. 4, to the adjacent terminal (22), thence to and through the magnet and its terminals (21h), by way of the connecting wire or wires, thence to the terminal (19a), and thence through the contacts (17a) and (15a) and the connecting wire or wires between the latter and the terminal (23) back to the other service terminal (20). The closing of this circuit energizes the magnet (6b), whereupon its core (5") is attracted and pulls spindle (4) to the right, the movement 0f said spindle closing clutch (3b) and opening clutch (3a), with the result that the righthand turn-table starts to rotate and the lefthand turn-table stops. It is understood, of course, that disks have been placed upon both turn-tables, and that the styli of both sound-boxes have been placed in playing position before the operation of the instrument commences, so that the right-hand phonograph will be ready to play the instant that its turn-table starts to rotate. So, after the completion of playing of the record on the left-hand turn-table, that record is removed therefrom and replaced by the next record in order, and the corresponding sound-box and tone arm are moved back to position the stylus at the beginning of the record. The same general actions then take place with the right-hand phonograph as have just been described in connection with the Vleft-hand phonograph. That is to say, the tone arm (12b) and sound-box (13b) swing inward as playing continues, until the contacts (15b) and (17") engage, whereupon the other magnet circuit containing the magnet (6) is closed. The closing of this circuit energizes said magnet (6a) which, in turn, attracts its core (5a), the movement of the latter pulling spindle (4) to the left to close clutch (3a) and upon clutch (3b). `The motor shaft then proceeds to rotate the left-hand turn-table shaft, the motion of the righthand shaft ceasing. Vhen the last-mentioned circuit` is closed by the engagement of the contacts (15") and (179), current passes from 011e service terminal (20) to and through magnet (6a) and its terminals (21), thence through the connecting wire or wires to the terminal (19h), and thence through the contacts (17h) and (15b) and connecting wire or wires and the terminal (23) to the other service terminal (20).

It is seen that the alternating operation of the two reproducers is automatic, and there will be no interruptions to the reproduction caused by changing record disks, as is the case with phonographs hitherto known.

Having thus described my invention what I claim is:

1. In a sound recording and reproducing apparatus, the combination, with a pair of record supports, a tone arm movable across each support, and a shaft whereon each support is mounted; of a motor; and an electrical systemfor driving said shafts in alternation from said motor, comprising alternately-acting means for determining the shaft to be driven, a pair of magnets connected to actuate said determining means, a pair of normally-open magnet circuits, a pair of stationary contact plates, one in each circuit, located beneath the record supports, a contact pin mounted in each record support and extending vertically above and below the same, the lower end of each pin slidably engaging the adjacent contact plate, and a contact member in each circuit and connected to move with one of said tone arms so as to engage the upper end of the adjacent contact pin at the conclusion of playing of a record on the corresponding support.

2. In a sound-recording and reproducing apparatus, the combination, with a pair of record supports, a tone arm movable across each support, and a shaft Whereon each support is mounted; of-a motor; a hollow driving shaft associated therewith; an endwise movable spindle mounted in said holnarines nw stan a aan naman-aaa panting f beyond the same at opposite ends; a driving connectionbetween each end of said playing movement ot each toire arm across l the record on the corresponding support;

thereby to uncouple the driving connection. between said spindle and the corresponding record support shaft and simultaneously couple the driving connection between the spindle and the other record support shaft.

3. lin a sound-recording and reproducin apparatus, the combination, with a pair oi record supports, a tone arm movable yacross 'each support, and a shaft whereon each support is mounted; of a' motor; a hollow driv-r lng-shaft associated therewith; an endwise movable spindle inolnted in said hollow shaft lto rotatetherewith and projecting beyond the same at opposite lends; a driving connection betweeneachend. oi said spindle and the-adjacenty record support shaft, each driving connection incllidlng a.

device which is alternately con ledland uncoupledzby the movements of said spindle in one direction or the other; `and .an electrical Y system for automatically' edecting ,the endwisemovement oli said 'spindle vat the con' clusion oil theplaying movement oit' each tone arm' acrosstheI record on lthe correspending support, thereby'to uncouple the driving' connection' between said spindle and the corresponding recordsupport shaitand record support shalt; said system compris ing a pair oit magnets connected with the opposite ends of said spindle, a pair et mag-A net circuits, and circuit-closing means vim: eachk circuit.. v

d. lin a sound-recording and 'reproducing apparatus, the combination, with a, pair of record supports, a tone arm movable across each support, and a shaft whereon each support is mounted; oi a motor; a hollow driving shaft associated therewith; an endwise "movable spindle mounted in said hollow v shailtto rotate therewith and projecting ben hlt* yond the same at opposite ends; adriving connection between each end' oi 'saidspindle dii and the adjacent record support shain'each driving connection including a devicew'hich Y is alternately coupled and unconpled by the movements of said spindle in one. direction or the other; and 'an electricalsystem tor automatically enacting' the endwise move-4 ment of said spindle at the conclusion 'ot the playing movement ot each tonel arm acrossy the'record on the corresponding support, thereby to uncouple the driving lconnection between said spindle and the corresponding record support shaft andjsimulasY taneouslyl couple the driving connection be- A tween the spindle and the other record support shaft; said. system comprising 'a' pair of magnets connected with the opposite ends of said spindle, a pair of ,magnet circuits, 'and circuit-closing means for each circuit embodying a pair of cooperating contacts,

one connected to movewith the record support, andthe other to move with the tone larin into engagementwith the tirstfnamed contact.

ln testimony whereofY l have amxed my signature.I y lhlDnlalECl@ NURllEGA. 

